Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command User Manual
Page 232
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13–17
PLC Addressing
Publication 1770Ć6.5.16 - October 1996
PLCĆ5 Floating Point
PLC-5 type reads and type writes use the IEEE floating point.
(This is the default for PLC-5 processors.) This means data is
returned:
•
low word then high word
•
low byte then high byte
Example: PLCĆ5 type read
2.0
=
FF
FF
FF
BF
1000.00 =
00
00
7A
44
low high
low high
low word
high word
exponent
MSB Ć mantissa
middle MSB Ć mantissa
LSB Ć mantissa
Example: PLCĆ5 word range read
1000.00 =
7A
44
00
00
2.0
=
FF
BF
FF
FF
3.0
=
40
C0
00
00
low high
low high
low word
high word
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